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    <title>Document</title>
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    <ol>
        <li><a href="dds">打地鼠</a></li>
        <li><a href="clock">钟表</a></li>
        <li><a href="3D">3D图片</a></li>
        <li><a href="dazi">打字练习</a></li>
        <li><a href="fengche">风车</a></li>
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